| 摘要 |
Supplemental portions are added to lead portions of a voice coil attached to a coil bobbin. The supplemental portions each has a shape, which can be restored repeatedly in response to stress, applied to the lead portions. In the case where stress is exerted on the lead portions under the influence of the pulling stress and compressive stress produced in the winding portion when a large driving current is supplied to the voice coil, the supplemental portions are deformed, thereby preventing the wire breaking at the lead portions.
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